From the manufacturer's website:
Drive Medical Fingertip Pulse Oximeter - MQ3000
- Large easy-to-read multi-view LED display screen
 - Displays SpO₂ and pulse rate
 - Low power consumption, Auto-off function
 - Approximately 30 hours of normal operation
 - Accommodates a wide range of finger sizes from pediatric to adult
 - Includes lanyard and two AAA batteries.
 - Perfect for sports enthusiasts to measure oxygen saturation and pulse rate
 
*These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure or prevent any disease.